v(x)=(16-2x)(21-2x)(x)

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Solution for v(x)=(16-2x)(21-2x)(x) equation: 


Simplifying
v(x) = (16 + -2x)(21 + -2x)(x)

Multiply v * x
vx = (16 + -2x)(21 + -2x)(x)

Reorder the terms for easier multiplication:
vx = x(16 + -2x)(21 + -2x)

Multiply (16 + -2x) * (21 + -2x)
vx = x(16(21 + -2x) + -2x * (21 + -2x))
vx = x((21 * 16 + -2x * 16) + -2x * (21 + -2x))
vx = x((336 + -32x) + -2x * (21 + -2x))
vx = x(336 + -32x + (21 * -2x + -2x * -2x))
vx = x(336 + -32x + (-42x + 4x2))

Combine like terms: -32x + -42x = -74x
vx = x(336 + -74x + 4x2)
vx = (336 * x + -74x * x + 4x2 * x)
vx = (336x + -74x2 + 4x3)

Solving
vx = 336x + -74x2 + 4x3

Solving for variable 'v'.

Move all terms containing v to the left, all other terms to the right.

Divide each side by 'x'.
v = 336 + -74x + 4x2

Simplifying
v = 336 + -74x + 4x2

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